I have a 2014 Charger RT 5.7 with 33,000 miles, I just installed a AFE cold air intake and Corsa Extreme exhaust. I was looking to get a diablo tuner but wanted to know if I should run the 89 octane tune or is it safe to run the 93 octane? It is safe and worth the extra gas money? It is my daily driver.
You'll make more power with the 93 tune provided you have 93 octane available.
OR you can use 89 octane plus Aces IV and get the same octane effect while reducing wear and increasing upper cylinder lubricity. It ends up costing less than straight 93 alone.
You're safe as long as you use a fuel octane rating that is equal to, or greater than, the octane supported by the tune.
So the 93 octane tune is safe as long as you use 93 octane fuel. Do not install a 93 octane tune and then drive with a lower octane fuel ... unless you use additives to raise the effective octane to 93.
If you install the 93 octane tune, you can always install one of the lower octane tunes (89, 91) in the future if fuel prices get too high and 93 octane becomes too expensive. Any of the DiabloSport canned tunes will be safe for the mods on your car (CAI, exhaust). It's only when you get into custom tunes for forced induction, camshafts, headers, etc ... that you can not go back to a stock or canned tune; unless you remove the mods that required the custom tune.
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The nice thing with the tuner is that you can change tunes whenever you want, just make sure you have the right fuel in the tank.
For example, you can have 89 oct. in the tank and run that tune for a while, but if you have 1/2 tank of 89, and put in 1/2 of 93, you're only going to have about 91 oct. total. Just be aware of that.
I also use ACES IV and have had good results with it. Call Brian and ask about it, but be sure to have at least 30 minutes or more to talk with him.
I couldn't help but laugh at this but it's so true. Brian's customer service is exceptional and he manages to explain complex tribology in a way that makes it easy to understand.
And yes, be prepared to spend some time on this call!
Two things. First off I also am an Aces fan. I run it in my SP but I use the recommended 91 Octane fuel instead of 89. I tried 89 with aces but was not happy with the result. My car just feels smoother and more athletic with 91.
Second: I owned a Diablo intune and used it on my 2011 Rt. After experimenting with it over several months I found the canned 91 tune to perform the best overall. I used aces in that car too. There are several things you can do with the tuner as well like checking codes, data logging and adjusting things like throttle response and shift firmness. However, I will say that it did next to nothing for noticeable power increase as it does not add that much. I bought it more for the adjustable abilities and for potential custom tunes in the future. Since I know longer have my 2011 Rt I sold it a few years back.
I agree the canned tunes (I also use the 91 octane tune) do not make a drastic difference in performance. I think it's because the generic tune is a conservative tune that operates within guaranteed safe parameters. It's a step above the OE stock tune but not that noticeable if you already have the factory R&T and STP options. However, I noticed a distinct difference with the HemiFever 91 octane custom tune. Obviously a custom tune is not a generic tune and they perform data log analysis to make additional tuning adjustments to how your engine is performing with the tune.
It's a apples-to-oranges comparison (generic tune vs custom tune) but if you want more, after installing the canned tune, a custom tune makes a noticeable difference.
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I would definitely agree with this. The canned tunes are average at best. The custom tunes are where the car really seems to shine since so many more parameters can be adjusted through CMR.
It's good advice for people just getting into this to understand that they'll only see optimal results with a custom tune.
Diablo stock tunes are about as safe as you're going to find any after market tune... however, they will never test to the same limits as the OEM.
HAving said that, I've been running 93 with 93 tune for years... including towing a pretty heavy trailer. Only issue I had, was stop and go traffic with the trailer, temp would get into a runaway condition and high speed fans were way too slow to come on.
PD, Do you have an extra oil cooler on your car? Sounds like you need one when towing. Maybe a bigger radiator, too. There's info on those in my Road Course Prep. thread.
The DiabloSport 'modify parameters' menus give you the option to change the temperature settings for when the fans turn On. You also have the option to install a 180° F thermostat; in which case, you need to change the fan settings.
The OE installed thermostat is a 203° F thermostat. The thermostat is closed below 195°F. Above this temperature, coolant is allowed to flow to the radiator.
Up to a coolant temperature of approximately 189° F, the main valve is closed and the bypass valve fully open. The flow through the radiator is interrupted and coolant flows through the bypass passage directly to the inlet side of the water pump.
The main valve begins to open at a coolant temperature of 189° F, and a small amount of coolant flows through the radiator. As the engine temperature increases, the main valve opens further and the bypass valve gradually closes. More coolant flows through the radiator and less coolant flows through the bypass passage.
The main valve is fully open at a coolant temperature above 216° F. The bypass plate seals off the bypass passage. The entire quantity of coolant flows through the radiator.
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